US Patent 9725857 Crash cushion

The crash cushion includes: a rail installed on the ground surface; a front support that is installed on a front end of the rail and is pushed backward along the rail when a shock is applied to the front support; a rear support installed on a rear end of the rail; and a shock absorber that is installed extending from the front support to the rear support and disposed at a predetermined height from the ground surface. The shock absorber includes a punch and a pipe, and it absorbs shock in such a way that the pipe is expanded in diameter by the punch. The crash cushion is installed on a road and can effectively absorb shock caused by a vehicle collision.